The columns that are returned are exactly those that are stored in the
archive for that catalog. Each catalog is different. Please check the
project's documentation for each catalog separately, all of which are
available at IRSA. Some of the more commonly...

To uncompress the files you have downloaded from the command line,
type "unzip .zip". To uncompress multiple files at once, type "unzip
'*.zip'" (the single quotes are important), or "unzip \*.zip" -- you
just have to escape out the wildcard.
Double...

Yes. The IRSA YouTube channel [1] has several tutorials on archives
housed at IRSA -- there are playlists organized by archive as well as
a set of "micro-tutorials" relevant for more than one archive. The
videos are in HD; you may need to manually use the...